is sure that

USAGE SUMMARY

The phrase "is sure that" is correct and commonly used in written English.
It expresses confidence or certainty about something. Example: "She is sure that she locked the door before leaving the house."

✓ Grammatically correct

News & Media

Science

Wiki

Human-verified examples from authoritative sources

Exact Expressions

58 human-written examples

Simon Dow, chief executive of the Guinness Trust, is sure that would be a big mistake.

The Guardian

But she says she is sure that will change once the town gets its facelift.

The New York Times

Isabelle is sure that Bourdin "can change".

The New Yorker

He is sure that others were involved.

The Guardian

But Netanyahu is sure that he knows better.

The New Yorker

She is sure that her mother has ruined it.

The New Yorker

But not everyone is sure that quantity can ensure quality.

The New York Times

But he is sure that guilt is not behind it.

The New York Times - Sports

Not everyone is sure that the growth will continue.

The Guardian - Business

But Mr. Doctoroff is sure that New York will prevail.

The New York Times

But no one is sure that this enthusiasm will linger.

The Guardian - Sport

Expert writing Tips

Best practice

Use "is sure that" when you want to express a high degree of confidence or certainty about a particular fact or outcome. Be mindful of the context to ensure your conviction aligns with the available evidence.

Common error

Avoid using "is sure that" when you lack concrete evidence. Overstating your certainty can undermine your credibility if the situation proves otherwise.

Linguistic Context

The phrase "is sure that" functions as an assertion of certainty. It indicates that a subject possesses a strong belief or conviction about a particular fact, event, or outcome. As Ludwig AI confirms, the phrase expresses confidence.

Expression frequency: Very common

Frequent in

News & Media

67%

Science

19%

Wiki

5%

Less common in

Formal & Business

3%

Encyclopedias

0%

Social Media

0%

Ludwig's WRAP-UP

In summary, the phrase "is sure that" is a common and grammatically correct way to express a strong belief or conviction. As Ludwig AI confirms, it conveys a sense of certainty and confidence. It is most frequently used in News & Media, and scientific contexts. When using this phrase, it's important to ensure your level of certainty aligns with the available evidence to maintain credibility. Alternatives such as "is certain that" or "is convinced that" can be used to express similar meanings. However, the user should be aware that overstating confidence without proof may damage their personal credibility.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

is certain that

Replaces "sure" with "certain", emphasizing a firm conviction.

has no doubt that

Emphasizes the absence of uncertainty or hesitation.

is convinced that

Indicates a strong belief based on evidence or reasoning.

is confident that

Conveys a sense of assurance and trust in something.

is positive that

Highlights an optimistic certainty about something.

firmly believes that

Stresses the strength and conviction of the belief.

is persuaded that

Highlights the act of being convinced through influence or reasoning.

knows for a fact that

Emphasizes the knowledge of a situation based on proven evidence or experience.

is of the opinion that

Formally expresses a personal judgment or view.

ascertains that

Indicates that the subject has discovered or verified something to be true.

FAQs

How can I use "is sure that" in a sentence?

You can use "is sure that" to express a strong belief or conviction about something. For example, "She "is sure that" she locked the door" indicates her confidence in having locked the door.

What are some alternatives to "is sure that"?

Alternatives include "is certain that", "is convinced that", or "has no doubt that", which all convey a similar sense of confidence or belief.

When is it appropriate to use "is sure that"?

It's appropriate to use "is sure that" when you have a strong reason to believe something is true, based on evidence, experience, or intuition. However, it's important to avoid overstating certainty when the situation is still uncertain.

What's the difference between "is sure that" and "thinks that"?

"Is sure that" conveys a stronger sense of certainty than "thinks that". While "thinks that" suggests a possibility or opinion, "is sure that" expresses a firm conviction or belief.